KR20060046316A - Wireless communication terminal, hand-off execution method, and hand-off execution program - Google Patents

Abstract

The wireless communication terminal wirelessly communicates with the base station using the first communication method and the second communication method, and an idle state in the second communication method is intermittently performed under the communication state in the first communication method. The wireless communication terminal is provided with a control unit that does not switch the base station in the idle state of the terminal to another base station until a predetermined number of times fails in receiving a signal transmitted from the base station in the idle state of the terminal using the second communication method. Doing.

Description

Wireless communication terminal, handoff execution method and handoff execution program {WIRELESS COMMUNICATION TERMINAL, HAND-OFF EXECUTION METHOD, AND HAND-OFF EXECUTION PROGRAM}

1 is a block diagram showing the configuration of a wireless communication terminal 200 according to an embodiment of the present invention;

2 is a view for explaining a state of the RF control unit 40 in the standby state,

3 is a view for explaining a state of the RF control unit 40 when a handoff occurs in the CDMA 1x method;

4 is a view for explaining the state of the RF control unit 40 when performing a standby process in the 1x method during the communication of the 1xEV-DO method;

5 is a view for explaining a state of the RF control unit 40 when a handoff occurs in the CDMA2000 1x method during communication of the 1xEV-DO method.

6 is a flowchart showing a handoff process;

7 is a flowchart showing normal mode handoff processing;

8 is a flowchart showing a mobile mode handoff process;

9 is a flowchart showing a fixed mode handoff process.

Explanation of symbols for the main parts of the drawings

10: antenna

20: 1x RF section

30: DO RF unit

40: RF control unit

50: system control unit

60: system memory

70: GPS unit

80: UI part

90: opening and closing detection unit

100A, 100B: Base station

200: wireless communication terminal (mobile phone terminal)

This application is a priority claim of Japanese Patent Application No. 2004-160799, filed May 31, 2004, the entire contents of which are incorporated herein by reference.

The present invention relates to a wireless communication terminal, a handoff execution method, and a handoff execution program for performing communication by switching between two communication methods using a common antenna.

BACKGROUND OF THE INVENTION Dual wireless communication terminals are known which can switch between two communication methods to communicate with a base station. In this specification, two communication methods can be switched using a common antenna, and even if only one communication method is used at the time of communication, the incoming communication can be monitored by measuring the wireless communication state of both communication methods. A dual type wireless communication terminal, in particular, is called a hybrid wireless communication terminal.

As related documents, see Japanese Patent Laid-Open No. 2003-298762.

In the hybrid communication terminal of the hybrid system, in particular, the hybrid communication terminal using the CDMA2000 1x system for voice communication mainly and the 1xEV-DO system dedicated for data communication uses the CDMA2000 1x during data communication using the 1xEV-DO system. In order to monitor the incoming call by the scheme, data communication using the 1xEV-DO scheme is suspended at predetermined intervals (for example, at intervals of 5.12 seconds) to monitor the incoming call by switching the use of the antenna and the radio unit to the CDMA2000 1x scheme. After that, when the incoming call monitoring process is completed, the antenna and the radio unit are switched to the 1xEV-DO system, and data communication is resumed.

When the area where the wireless communication terminal exists is near the boundary of the service area of a plurality of base stations used for the CDMA2000 1x method, that is, when the quality (for example, RSSI value) of the signal received from the base station is in conflict with each other. The CDMA2000 1x scheme may frequently repeat idle hand-off (handoff performed in the idle state). In such a situation, in order to monitor the incoming call using the CDMA2000 1x method, the 1xEV-DO method is repeatedly converted to the CDMA2000 1x method at the predetermined intervals described above, and the CDMA2000 1x method monitoring process is performed. At this time, if the idle handoff of the CDMA2000 1x system is detected, and the idle handoff is continuously detected after the end of the idle handoff process, the occupation of the antenna unit and the radio unit of the wireless communication terminal by the CDMA2000 1x system continues. When this occupation has elapsed for a certain time, the 1xEV-DO system determines whether system loss has occurred and starts the interruption of data communication.

That is, regardless of the state of wireless communication of the 1xEV-DO system, the idle handoff repeated by the CDMA2000 1x system interrupts data communication by the 1xEV-DO system.

An object of the present invention is to communicate between a base station by switching between a first communication method and a second communication method, and during communication using the first communication method, even if the idle handoff is frequently repeated under the second communication method. The present invention provides a wireless communication terminal, a handoff execution method, and a handoff execution program that prevent an unexpected interruption of data communication.

The present invention provides a wireless communication with a base station using a first communication method and a second communication method, an idle state in the second communication method is intermittently performed under a communication state in the first communication method, and Provides a wireless communication terminal having a control unit that does not switch the base station to another base station in the idle state of the terminal until a predetermined number of times fails to receive a signal transmitted from the base station in the idle state of the terminal using the two communication schemes do.

The control unit does not switch the base station to another base station in the idle state of the terminal until a predetermined number of times of failure in receiving the signal transmitted from the base station in the idle state of the terminal using the second communication scheme described above. "Control unit for switching the base station in the idle state of the terminal to another base station when the wireless communication terminal has failed a predetermined number of times to receive a signal transmitted from the base station in the idle state of the terminal using the second communication method" it means.

The wireless communication terminal further includes a movement detecting unit for detecting a movement state of the wireless communication terminal, and the control unit determines whether the wireless communication terminal is moving based on the result obtained by the movement detecting unit, and the control unit determines that the wireless communication terminal is If it is determined that the mobile communication terminal is not moving, the control unit changes the base station from the idle state of the terminal until the wireless communication terminal fails to receive a signal transmitted from the base station in the idle state of the terminal using the second communication scheme. Do not switch to a base station.

If the above-described control unit determines that the radio communication terminal is not moving, the control unit fails to predefine a number of times when the radio communication terminal receives a signal transmitted from the base station in the idle state of the terminal using the second communication method. "Do not switch the base station to another base station in the idle state of the terminal until". "When the wireless communication terminal fails a predetermined number of times to receive a signal transmitted from the base station in the idle state of the terminal using the second communication common sense. , To switch the base station in the idle state of the terminal to another base station. "

In the wireless communication terminal, the movement detection unit detects a movement state using GPS.

In the wireless communication terminal, the movement detection unit acquires information about the application under execution by the wireless communication terminal, and detects the movement state based on the acquired information about the application.

The wireless communication terminal is designed to be openable and close, and the movement detection unit detects the moving state based on the open / closed state of the housing of the wireless communication terminal.

In the radio communication terminal, the first communication method is used for at least data communication, and the second communication method is used for at least a voice call.

In a wireless communication terminal, a first communication method is a CDMA2000 1xEV-DO method, and a second communication method is a CDMA2000 1x method.

In addition, the present invention allows the wireless communication terminal to perform wireless communication with the base station by using the first communication method and the second communication method, and the idle state in the second communication method is intermittently under the communication state in the first communication method. Performed to provide a handoff execution program for executing a handoff operation of a base station in an idle state of a terminal using a second communication scheme, wherein the handoff execution program is an idle of the terminal using the second communication scheme. A first step of determining whether or not a predetermined number of times of receiving a signal transmitted from a base station in a state has failed; and a pre-determining of a wireless communication terminal receiving a signal transmitted from a base station in an idle state of a terminal using a second communication scheme If the failed number of times has passed, the other base from the base station in the idle state of the terminal In a second step of conversion.

The handoff execution program further includes a third step of detecting a moving state of the wireless communication terminal and determining whether the wireless communication terminal is moving, and the first and second only when it is determined that the wireless communication terminal is not moving. Run the second step.

In the handoff execution program, in the third step, GPS is used to detect the movement state of the wireless communication terminal.

In the handoff execution program, in the third step, information about an application under operation by the wireless communication terminal is obtained, and the moving state of the wireless communication terminal is detected based on the obtained information about the application.

In the handoff execution program, the wireless communication terminal is designed to be openable and open, and in the third step, the moving state of the wireless communication terminal is detected based on the open / closed state of the housing of the wireless communication terminal.

In addition, the present invention provides a wireless communication terminal wirelessly communicates with a base station using a first communication method and a second communication method, and an idle state in the second communication method is intermittently performed under a communication state in the first communication method. The present invention provides a handoff execution method of a wireless communication terminal performing a handoff operation of a base station in an idle state of a terminal using a second communication method, and the handoff execution method of a wireless communication terminal includes: A first step of determining whether a predefined number of failures in receiving a signal transmitted from the base station in the idle state of the terminal using the scheme and from the base station in the idle state of the terminal in which the wireless communication terminal uses the second communication scheme If the predefined number of failures in receiving the transmitted signal fails, the terminal returns to the base station in the idle state. A second step of switching from another base station to another.

The handoff execution method further includes a third step of detecting a moving state of the wireless communication terminal and determining whether the wireless communication terminal is moving, and only when it is determined that the wireless communication terminal is not moving. Run the second step.

In the handoff execution method, in a third step, GPS is used to detect a movement state of a wireless communication terminal.

In the handoff execution method, in a third step, information about an application under execution by the wireless communication terminal is obtained, and the moving state of the wireless communication terminal is detected based on the obtained information about the application.

In the handoff execution method, the wireless communication terminal is designed to be openable and open, and in a third step, the moving state of the wireless communication terminal is detected based on the open / closed state of the housing of the wireless communication terminal.

In addition, the present invention provides a wireless communication terminal for wirelessly communicating with a base station using a first communication method and a second communication method, and bringing the first communication method and the second communication method into an available idle state, and wireless communication. The terminal, when the difference between the quality of the signal transmitted from the base station in the idle state of the terminal and the quality of the signal transmitted from another base station exceeds the predefined threshold, the base station in the idle state of the terminal And a movement detecting unit for detecting a movement state of the wireless communication terminal, wherein the control unit determines whether the wireless communication terminal is communicating using the first communication method, In the case of communicating using the first communication method, it is determined based on a result obtained by the movement detection unit. Thereby varying the threshold.

According to the wireless communication terminal, the handoff execution method and the handoff execution program, the occurrence frequency of the handoff under the second communication method can be reduced in communication using the first communication method. Therefore, unexpected disconnection of data communication hardly occurs during communication using the first communication scheme. As a result, stable data communication can be provided, and throughput of data communication can be improved.

An embodiment of the present invention will now be described with reference to the drawings.

1 is a block diagram showing the configuration of a wireless communication terminal according to an embodiment of the present invention.

The wireless communication terminal (cellular phone terminal) 200 according to the present embodiment uses the common antenna 10 to communicate with CDMA2000 1x (hereinafter referred to as "1x system") and 1xEV-DO communication system ( In the following, the " DO method " can be switched to communicate with each other by moving between the base station 100A and the base station 100B through a handoff operation.

Via the antenna 10, the radio frequency signal received from the 1x RF unit 20 or the DO RF unit 30 is converted into an electric wave and transmitted to the base station 100A or 100B, or the base station 100A or The radio wave received from 100B is received, converted into a high frequency signal, and transmitted to the 1x RF unit 20 or the DO RF unit 30.

The 1x RF unit 20 converts the data signal or voice signal transmitted using the 1x scheme into a high frequency signal and sends the high frequency signal to the antenna 10. The 1x RF unit 20 converts the high frequency signal received through the antenna 10 into a data signal or a voice signal.

The DO RF unit 30 converts the data signal transmitted using the DO method into a high frequency signal and sends the high frequency signal to the antenna 10. The DO RF unit 30 converts a high frequency signal received through the antenna 10 into a data signal.

The RF controller 40 controls the communication performed using two methods, namely the DO method and the 1x method, and also the pilot signal strength (RSSI) of the pilot signal transmitted by the base station 100 to the antenna 10. ) Is also measured.

The system controller (system control unit) 50 controls each part of the wireless communication terminal 200 collectively. The system controller 50 controls the RF control unit 40 to switch between the DO method and the 1x method. Particularly in the idle state, the system controller 50 selectively converts these two communication schemes at predetermined time intervals, waiting for the arrival of an incoming call using either of the two communication schemes. Further, the system controller 50 determines whether or not to perform the handoff operation based on the pilot signal strength transmitted by the base station to the antenna 10 in the idle state while waiting for the arrival of the call when using the 1x scheme. Determine. Thereafter, when it is determined that handoff is necessary, the system controller 50 executes handoff processing. It should be noted that in this specification, the operation of switching to another connected base station is called a handoff operation. The system controller 50 also determines whether or not the wireless communication terminal 200 is currently moving, using the positional information obtained by the global positioning system unit (GPS) 70.

The system storage unit 60 is constituted by a memory such as RAM, and is used to store applications and temporary data.

A GPS (Global Positioning System) unit 70 receives GPS signals from a plurality of GPS satellites and performs measurements for determining the position of the wireless communication terminal 200 by using the difference in time at which these signals are received. .

The UI unit 80 functions as an interface for a user who operates the wireless communication terminal 200 and includes an LCD display panel (main display, sub display) for displaying text and images, a speaker for outputting voice, and a voice input. Microphone, and input keys for accepting input by a user.

The open / closed state detector 90 detects the open / closed state of the wireless communication terminal 200. In this embodiment, the radio communication terminal 200 is a so-called clamshell in which two housings are connected so that both sides can be opened and closed. When the wireless communication terminal 200 is opened, data can be identified by the display panel of the housing, and voice communication can be performed using a microphone and a speaker provided in the housing. On the other hand, when the wireless communication terminal 200 is closed by closing the housing, the display panel, the microphone, and the speaker are hidden so that the display panel cannot be seen and voice communication is disabled. The open / closed state detector 90 detects a state (open or closed) of the housing and transmits the detection result to the system controller 50.

Instead of opening and closing the housing, the opened and closed state detector 90 may detect whether the antenna is stretched or not.

The operation of the wireless communication terminal of this embodiment will now be described.

According to the wireless communication terminal 200 of the present embodiment, the RF controller 40 is shared by the 1x method and the DO method, so that one method of performing communication may monopolize the RF controller 40.

2 is a view for explaining the state of the RF controller 40 in the idle state of the wireless communication terminal 200.

The 1x method and the DO method execute an idle state process for detecting a pilot signal indicating an incoming call when each predetermined timing period expires (5.12 seconds in this embodiment), thereby providing an RF controller 40 in each method. ) Is set to "Active". Since the RF controller 40 that performs idle state processing is monopolized in one way, these two ways are efficient at times when the idle states are different.

3 is a view for explaining the state of the RF control unit 40 when a handoff (idle handoff) occurs in the 1x manner when executing the idle state processing.

The wireless communication terminal 200 compares the pilot signal strength with the specific base station currently communicating with the best pilot signal strength among all the other base stations, so that the difference between the pilot signal strengths of these two base stations is predefined. If exceeding, handoff processing is performed for a specific base station. This handoff process (normal mode handoff process) will be described later with reference to FIG.

In the example of Fig. 3, when both the 1x system and the DO system perform idle state processing, handoff is performed by the 1x system. Since the timing for performing the idle state processing differs from base station to base station, the timing of the idle state processing is changed when switching to another base station to be communicated by the execution of the handoff process. Since the timing of performing the idle state processing of the 1x system is changed, the DO system also changes the timing of the idle state processing to avoid overlapping with the idle state processing timing of the 1x system. This timing change is achieved by exchanging a message predefined by the wireless communication terminal 200 and the base station.

4 is a diagram for explaining the state of the RF controller 40 when the idle state processing is performed by the 1x method while the DO system is in communication.

When communicating (data communication) using the DO method, when the time for performing the idle state processing using the 1x method is reached, the method used by the RF controller 40 is switched to the 1x method. After the idle state processing is completed, the method used by the RF controller 40 is switched back to the DO method.

FIG. 5 is a diagram for explaining a state of the RF controller 40 when a handoff occurs in the 1x system that is currently performing idle state processing during the DO system communication.

As described with reference to FIG. 4, when the DO method is in communication, the 1x method performs idle state processing at predefined time intervals. In the idle state processing, when the occurrence of the handoff is detected in the 1x scheme, the RF controller 40 and the base station 100 perform the handoff process. During the processing of this handoff, the RF controller 40 is operated exclusively by the 1x scheme. After that, when the handoff process ends, the control of the RF controller 40 is returned by the DO method, and communication is resumed.

Immediately after the detection of the 1x system handoff occurrence, if subsequent handoff processing is detected continuously, the operation of the RF controller 40 of the radio communication terminal by the 1x system is continued, so that communication performed by the DO system is performed by hand. It cannot be resumed until the off processing is completed. As the DO method, since the data communication is designed to be disconnected when interrupted for a predetermined time period, if the operation of the RF controller 40 by the 1x method continues, the handoff process is performed, so that the DO method is performed. The communication becomes interrupted and the time of the predetermined period elapses, so that the data communication is disconnected by the DO.

Therefore, as will be described later, the wireless communication terminal 200 of the present embodiment determines whether the current communication is being performed by the DO method, and if data communication is currently performed, lowers the frequency of handoff in the 1x method. Further, it is determined whether the radio communication terminal 200 is moving, and if the radio communication terminal 200 is not moving or not moving and is stopped, the frequency of handoff occurring in the 1x system is minimized as necessary. Decrease.

6 is a flowchart showing the handoff process performed by the system controller 50.

First, the system controller 50 determines whether current data communication is performed by the DO method (step 1001). When it is determined that data communication is not performed by the DO method, the system controller 50 performs normal mode handoff processing (Fig. 7). On the other hand, when it is determined that the current data communication is being performed by the DO method, the system controller 50 determines whether the current mode is the "moving mode" or the "fixed mode" (step 1002).

When the wireless communication terminal 200 is currently moving, the system controller 50 determines that the operation mode is "move mode". On the other hand, when the radio communication terminal 200 does not move (the moving range or the moving speed is extremely small), the system controller 50 determines that the operation mode is the "fixed mode".

In determining the operation mode, the system controller 50 uses the current position of the wireless communication terminal 200 acquired by the GPS unit 70 for a time of a predefined period. Therefore, when the distance traveled during this time exceeds a predefined distance, for example, when the distance traveled for 10 seconds exceeds 100 m, the system controller 50 determines that the operation mode is the travel mode, and otherwise In this case, it is determined that the operation mode is the "fixed mode".

The system controller 50 may use the state of the housing detected by the open / close state detector 90 to determine the mode of operation. For example, when the wireless communication terminal 200 is stably positioned, when viewing a streaming picture, the user may open the housing to view data represented on the main display panel. Alternatively, when moving the wireless communication terminal 200 while downloading data, the user may cover the housing and carry the wireless communication terminal 200 in its pocket or bag. In this case, when the housing is opened during data communication performed using the DO method, the system controller 50 may regard the operation mode as the "fixed mode", or when the housing is covered, the system controller 50 as the "move mode". You may.

Moreover, the open / close state detector 90 may also detect the stretch state of the antenna. When the antenna is extended, it may be determined that the wireless communication terminal 200 is located in a stable position and is probably watching a streaming picture. On the other hand, when the antenna is contracted, it may be determined that the wireless communication terminal 200 is likely to be carried in the pocket or bag of the user. Therefore, in the extended state of the antenna, the operation mode can be determined as the "fixed mode", and in the retracted state, the operation mode can be determined as the "moving mode".

It is an example of one or more determinations of the open / closed state detector 90 used. As described above, in the wireless communication terminal 200 of this embodiment, voice communication (voice communication using the 1x system) is possible only when the housing is opened, and voice communication is impossible when the housing is closed. Therefore, if the housing is closed during data communication performed using the DO method, voice communication is impossible, so the use priority of the 1x method is determined to be low, and the operation mode is set to "fixed mode" to reduce the frequency of handoff. Can also be determined. When the state of the antenna is detected, the same procedure used in the open / close state detector 90 is used. As a result, in the extended state of the antenna, the operation mode can be determined as the "moving mode", and in the shrinking mode of the antenna, the operation mode can be determined as the "fixed mode". In addition, the system controller 50 may use an application currently operated by the wireless communication terminal 200 in order to confirm the "moving mode" or the "fixed mode". Specifically, when an application mainly used during the movement of the wireless communication terminal 200 is used, the operation mode is determined to be "moving mode". On the other hand, when an application mainly used when the wireless communication terminal 200 is stably positioned is used, the operation mode is determined to be "fixed mode". An example of an application used during the movement of the wireless communication terminal 200 is a "map display application". An example of an application used when the wireless communication terminal 200 is stably positioned receives and reads a stream picture. It is a "media player".

As described above, the GPS unit 70, the open / closed state detector 90, and the system controller 50 constitute a movement detection unit for detecting an operating state of the wireless communication terminal 200.

In step 1002, when the system controller 50 determines that the operation mode is "moving mode", the system controller 50 proceeds to the movement mode handoff process (step 1003, FIG. 8), or determines that the operation mode is "fixed mode". In the case, it proceeds to the fixed mode handoff process (step 1004, Fig. 9).

In the " mobile mode ", since there is a high possibility that handoff occurs in the 1x method, the frequency of handoff is reduced to avoid disconnection of data communication in the DO method. In the "fixed mode", since the radio communication terminal 200 does not move (the housing is covered or the performance priority of the voice communication is low), the handoff is prevented as much as possible.

7 is a flowchart illustrating normal mode handoff processing performed by the system controller 50.

"Normal mode" is processing when no communication is performed by the DO method.

First, the system controller 50 obtains a pilot signal strength (RSSI value) from the base station (step 4001). Here, it is assumed that the pilot signal strength of the base station currently communicating is "AP", and the one with the highest pilot signal strength among all other base stations is "NP".

Next, the system controller 50 determines whether the difference between the acquired two pilot signal strengths exceeds a predefined threshold (step 4002). Specifically, the system controller 50 determines that the value obtained by subtracting the pilot signal strength "AP" of the current base station from the pilot signal strength "NP" of the other base station is defined by the threshold value "A" before handoff determination. It is determined whether to exceed.

If the system controller 50 determines that the difference between the two pilot signal strengths does not exceed the predefined threshold, the process returns to step 4001 to repeat the same processing. However, if it is determined that the difference between the two pilot signal strengths has exceeded a predefined threshold, the system controller 50 executes a handoff process of switching from the current base station to another base station (step 4003).

8 is a flowchart showing the " moving mode " handoff process performed by the system controller 50. As shown in FIG.

First, the system controller 50 obtains a pilot signal strength (RSSI value) from the base station (step 2001). Here, it is assumed that the pilot signal strength with the base station currently communicating is "AP", and "NP" is the one with the best pilot signal strength among all other base stations.

Next, the system controller 50 determines whether or not the difference between the acquired two pilot signal strengths exceeds the threshold value A + α (step 2002). Specifically, the system controller 50 subtracts the pilot signal strength "AP" of the current base station from the pilot signal strength "NP" of another base station, and the value "α" previously defined in the threshold "A". It is determined whether or not the value obtained by adding " is exceeded, and the obtained value for determining whether or not handoff is executed in the normal mode is used.

If the system controller 50 determines that the difference between the two pilot signal strengths does not exceed a predefined threshold, the system controller 50 returns to step 2001 to repeat the same processing. However, if it is determined that the difference between the two pilot signal strengths has exceeded the threshold, the system controller 50 switches from the current base station to another base station and performs a handoff (step 2003). That is, the threshold value for determining handoff is raised higher than the threshold value in normal mode, so that the frequency of handoff occurs is reduced.

In the processing shown in Fig. 8, since the threshold value of the pilot signal strength used by the wireless communication terminal 200 for handoff is increased during data communication using the DO method, handoff occurs. Frequency can be reduced. Therefore, during data communication using the DO method, it is possible to prevent disconnection of the data communication due to the handoff occurrence in the 1x method.

9 is a flowchart illustrating fixed mode handoff processing performed by the system controller 50.

First, the system controller 50 obtains a pilot signal strength (RSSI value) from the base station (step 3001). Here, it is assumed that the pilot signal strength of the base station currently communicating is "AP", and "NP" is the one with the best pilot signal strength among all other base stations.

Next, the system controller 50 determines whether the reception of the signal from the current base station at the pilot signal strength "AP" is impossible, that is, whether the current AP signal is lost (step 3002). . If the system controller 50 determines that the AP signal has not been lost, the system controller 50 returns to step 3001 to repeat the same processing. If the system controller 50 determines that the AP signal is lost, the system controller 50 acquires the pilot signal strength AP of the current base station after the elapse of the next time period (after 5.12 seconds in this embodiment). Then, it is determined whether the acquired AP is lost (step 3003). If the system controller 50 determines that the acquired AP has not been lost, the system controller 50 returns to step 3001 to repeat the same processing. When the system controller 50 determines that the acquired AP is lost, that is, when it is determined that the roast of the pilot signal strength of the current base station is two consecutive times, the pilot signal strength NP of the base station other than the current base station is Determine if it is lost. If the system controller 50 determines that the NP has been lost, the system controller 50 switches from the current base station to the other base station in question (step 3005). Thereafter, the system controller 50 returns to the processing performed according to the flowchart of FIG.

In step 3004, when the system controller 50 determines that the NP has been lost, the system controller 50 loses the communication using the 1x scheme because both the current base station AP and the other base station NP have been lost. It is determined that the communication with the current base station has been terminated (step 3006). Thereafter, the system controller 50 searches for a pilot signal to initiate communication with another base station (step 3007).

According to the process of Fig. 9, since the communication is switched from the current base station to another base station by the handoff only when it is determined that the loss of communication with the current base station is two consecutive times, the frequency of handoff occurs as much as possible. Can be lowered. Therefore, during data communication using the DO method, disconnection of the data communication can be prevented due to the occurrence of handoff in the 1x method.

As described above, according to the wireless communication terminal 200 of the present embodiment, a hybrid terminal using both the CDMA2000 1x scheme and the 1xEV-DO scheme is used. When performing data communication using the 1xEV-DO scheme, CDMA2000 1x is possible. This can reduce the frequency of handoffs. By doing so, the wireless communication terminal 200 is located near the boundary of the service area of the plurality of base stations (when signal strengths (RSS1 values) of a plurality of base stations are in conflict), and handoff processing using the CDMA2000 1x system. Is frequently performed, it is possible to prevent unexpected disconnection of data communication under the 1xEV-DO scheme. As a result, stable data communication can be performed, and throughput of data communication can be improved.

According to the present embodiment, the pilot signal strength (RSSI value) was used to determine whether handoff was performed. However, it is also possible to use a carrier-to-interference ratio (C / I value) for the pilot signal.

In this embodiment, a hybrid wireless communication terminal using the CDMA2000 1x system and the 1xEV-DO system has been described. However, using a common antenna, two communication methods can be used, and also, by switching these communication methods, the wireless communication state of one communication method can be measured when the communication is performed using the other communication method, If the incoming call can be monitored, other communication terminal types can also be used.

In addition, in the present embodiment, the fixed mode handoff process has been described that the handoff is executed when the acquisition of the pilot signal transmitted by the base station fails twice in succession. However, if the number of failures is not limited to two, three, four or even one failures may be specified in advance. Further, not only when the acquisition of the pilot signal transmitted by the base station fails in a predetermined number of consecutive times, but also when the acquisition of the pilot signal intermittently fails a predetermined number of times for a specific time period, the processing of the handoff is performed. Is executed.

In addition, according to the present embodiment, the GPS unit 70 receives GPS signals from a plurality of GPS satellites and performs measurement based on the time difference of arrival of these signals in order to obtain the position of the wireless communication terminal 200. To perform. However, since a mathematical calculation is required to perform measurement to obtain the actual position, and the processing load imposed on the GPS unit 70 increases, the GPS unit 70 receives signals from a plurality of GPS satellites. The base station 100 transmits the information about the time difference to the base station 100, and the base station 100, based on the received information, performs calculations to obtain the position of the wireless communication terminal, and the result is transmitted to the wireless communication terminal ( 200).

In addition, in the present embodiment, a so-called foldable wireless communication terminal in which two housings are connected to each other so as to be open and close has been described, but the structure is not limited to this if the wireless communication terminal can be opened and closed. The wireless communication terminal may be, for example, a flip type that may cover and hide a part of a flip-type object that may cover only a part of the housing in which the protection member connected to the housing is opened or closed, or the two housings may be connected and rotate horizontally, respectively. It may be of a pivot type (horizontal pivot type), it may be a slide type that the two housings slide vertically to each other when opening and closing.

As described above, according to the present invention, the first communication method is switched between the first communication method and the second communication method, and the first communication method is used even if the idle handoff is frequently repeated under the second communication method. A wireless communication terminal, a handoff execution method, and a handoff execution program can be obtained which prevent an unexpected interruption of data communication during the used communication.

Claims (18)

A wireless communication terminal in which wireless communication is performed with a base station using a first communication method and a second communication method, and an idle state in the second communication method is intermittently performed under a communication state in the first communication method. The control unit does not switch the base station to another base station in the idle state of the terminal until the wireless communication terminal fails to receive a signal transmitted from the base station in the idle state of the terminal using the second communication method Wireless communication terminal having a. The method of claim 1, Further provided with a movement detector for detecting a movement state of the wireless communication terminal, The controller determines whether the wireless communication terminal is moving based on a result obtained by the movement detector, If the control unit determines that the wireless communication terminal is not moving, the control unit is predefined to receive the signal transmitted from the base station in the idle state of the terminal using the second communication method. The wireless communication terminal does not switch the base station to another base station in the idle state of the terminal until the number of times failed. The method of claim 2, And the movement detection unit detects the movement state using GPS. The method of claim 2, And the movement detection unit acquires information about an application under execution by the wireless communication terminal, and detects the movement state based on the acquired information about the application. The method of claim 2, The wireless communication terminal is designed to open and close, And the movement detecting unit detects the movement state based on an open / closed state of a housing of the wireless communication terminal. The method of claim 1, The first communication method is used at least for data communication, The second communication method is used at least for voice calls Wireless communication terminal. The method of claim 1, The first communication method is a CDMA2000 1xEV-DO method. The second communication method is a CDMA2000 1x method. Wireless communication terminal. The wireless communication terminal makes wireless communication with the base station by using the first communication method and the second communication method, and the idle state in the second communication method is intermittently performed under the communication state in the first communication method, In the handoff execution program to execute the handoff operation of the base station in the idle state of the terminal using a second communication method, A first step of determining whether the wireless communication terminal has failed a predetermined number of times to receive a signal transmitted from the base station in an idle state of the terminal using the second communication scheme; Switching from the base station to another base station in the idle state of the terminal when the wireless communication terminal fails to receive a predetermined number of times of receiving a signal transmitted from the base station in the idle state of the terminal using the second communication scheme. 2 steps Handoff execution program comprising a. The method of claim 8, Detecting a movement state of the wireless communication terminal and determining whether the wireless communication terminal is moving; Executing the first and second steps only when it is determined that the wireless communication terminal is not moving. Handoff Launcher. The method of claim 9, In the third step, a handoff executing program using GPS for detecting the movement state of the wireless communication terminal. The method of claim 9, In the third step, acquiring information about an application under operation by the wireless communication terminal, and detecting the movement state of the wireless communication terminal based on the obtained information about the application. The method of claim 9, The wireless communication terminal is designed to open and close, In the third step, detecting the movement state of the wireless communication terminal based on the open / closed state of the housing of the wireless communication terminal; Handoff Launcher. The wireless communication terminal performs wireless communication with the base station by using the first communication method and the second communication method, and the idle state in the second communication method is intermittently performed under the communication state in the first communication method, In the handoff execution method of the wireless communication terminal performing the handoff operation of the base station in the idle state of the terminal using a two communication method, A first step of determining whether the wireless communication terminal has failed a predetermined number of times to receive a signal transmitted from the base station in an idle state of the terminal using the second communication scheme; When the wireless communication terminal fails to receive a predetermined number of times to receive a signal transmitted from the base station in the idle state of the terminal using the second communication scheme, the terminal switches from the base station in the idle state to another base station 2nd step Handoff execution method of a wireless communication terminal comprising a. The method of claim 13, Detecting a movement state of the wireless communication terminal and determining whether the wireless communication terminal is moving; Executing the first and second steps only when it is determined that the wireless communication terminal is not moving. A handoff execution method of a wireless communication terminal. The method of claim 14, And in the third step, performing a handoff of a wireless communication terminal using GPS to detect the movement state of the wireless communication terminal. The method of claim 14, In the third step, acquiring information about an application under execution by the wireless communication terminal and detecting the movement state of the wireless communication terminal based on the obtained information about the application; . The method of claim 14, The wireless communication terminal is designed to open and close, In the third step, detecting the movement state of the wireless communication terminal based on the open / closed state of the housing of the wireless communication terminal; A handoff execution method of a wireless communication terminal. A wireless communication terminal for wirelessly communicating with a base station using a first communication method and a second communication method, and causing the first communication method and the second communication method to be in an available idle state. If the difference between the quality of the signal transmitted from the base station in the idle state of the terminal and the quality of the signal transmitted from another base station exceeds a predefined threshold, the base station in the idle state is A control unit for switching from the base station to another base station; A movement detector for detecting a movement state of the wireless communication terminal Provided with The control unit determines whether the wireless communication terminal communicates using the first communication method, and when the wireless communication terminal communicates using the first communication method, acquired by the movement detection unit. Varying the predefined threshold based on the result Wireless communication terminal.

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